Demo/Domain/UseCase/PresenceUseCase.cs

using System.Security.Cryptography.X509Certificates;
using Demo.Data.Repository;
using Demo.Domain.Models;

namespace Demo.Domain.UseCase
{
    public class PresenceUseCase : IPresenceUseCase
    {
		private readonly IUserRepository _repositoryUserImpl;
        private readonly IPresenceRepository _repositoryPresenceImpl;
        private readonly IGroupRepository _repositoryGroupImpl;

        public PresenceUseCase(IPresenceRepository repositoryPresenceImpl, IUserRepository repositoryUserImpl, IGroupRepository repositoryGroupImpl)
        {
            _repositoryPresenceImpl = repositoryPresenceImpl;
            _repositoryUserImpl = repositoryUserImpl;
            _repositoryGroupImpl = repositoryGroupImpl;
        }

        public List<Presence> GetPresenceByGroup(int groupID){
            var usersByGroup = _repositoryUserImpl.GetAllUser()
            .Where(user => user.GroupID == groupID).ToList();

            var presenceByGroup = _repositoryPresenceImpl.GetPresenceByGroup()
            .Where(x => usersByGroup.Any(user => user.Guid == x.UserGuid))
            .Select(presence => new Presence{
                User = new User{
                    Guid = presence.UserGuid,
                    Group = new Group{
                        ID = groupID,
                        Name = _repositoryGroupImpl.GetAllGroup().First(group => group.ID == groupID).Name
                    },
                    FIO = usersByGroup.First(user => user.Guid == presence.UserGuid).FIO, 
                },
                LessonNumber = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance
            }).ToList();

            return presenceByGroup;
        }
        
        public List<Presence> GetPresenceByGroupByTime(int groupID, DateOnly date){
            var usersByGroup = _repositoryUserImpl.GetAllUser()
            .Where(user => user.GroupID == groupID).ToList();

            var presenceByGroup = _repositoryPresenceImpl.GetPresenceByGroup()
            .Where(x => usersByGroup.Any(user => user.Guid == x.UserGuid && x.Date == date))
            .Select(presence => new Presence{
                User = new User{
                    Guid = presence.UserGuid,
                    Group = new Group{
                        ID = groupID,
                        Name = _repositoryGroupImpl.GetAllGroup().First(group => group.ID == groupID).Name
                    },
                    FIO = usersByGroup.First(user => user.Guid == presence.UserGuid).FIO, 
                },
                LessonNumber = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance
            }).ToList();

            return presenceByGroup;
        }

        public bool GeneratePresence(int firstLesson, int lastLesson, int groupID, DateOnly date){
            List<Presence> presenceList = new List<Presence>{};
            var usersByGroup = _repositoryUserImpl.GetAllUser().Where(x => x.GroupID == groupID);
            for (int i = firstLesson; i <= lastLesson; i++){
                foreach(UserLocalEntity user in usersByGroup){
                    presenceList.Add(new Presence{
                        User = new User{
                        Group = new Group{
                            ID = groupID,
                            Name = _repositoryGroupImpl.GetAllGroup().First(group => group.ID == groupID).Name
                        },
                        FIO = usersByGroup.First(user2 => user2.Guid == user.Guid).FIO, 
                        Guid = user.Guid
                    },
                    IsAttedance = true,
                    Date = date,
                    LessonNumber = i});
                }
            }

            var presenceLocalEntity = presenceList.Select(x => new PresenceLocalEntity{
                UserGuid = x.User.Guid,
                IsAttedance = x.IsAttedance,
                LessonNumber = x.LessonNumber,
                Date = x.Date
            }).ToList();

            _repositoryPresenceImpl.GeneratePresence(presenceLocalEntity);

            return true;
        }
    }
}